libio/filebuf.cc

   1 /* This is part of libio/iostream, providing -*- C++ -*- input/output.
   2 Copyright (C) 1993, 1995 Free Software Foundation
   3
   4 This file is part of the GNU IO Library.  This library is free
   5 software; you can redistribute it and/or modify it under the
   6 terms of the GNU General Public License as published by the
   7 Free Software Foundation; either version 2, or (at your option)
   8 any later version.
   9
  10 This library is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this library; see the file COPYING.  If not, write to the Free
  17 Software Foundation, 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18
  19 As a special exception, if you link this library with files
  20 compiled with a GNU compiler to produce an executable, this does not cause
  21 the resulting executable to be covered by the GNU General Public License.
  22 This exception does not however invalidate any other reasons why
  23 the executable file might be covered by the GNU General Public License.
  24
  25 Written by Per Bothner (bothner@cygnus.com). */
  26
  27 #include "iostreamP.h"
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30 #include <fcntl.h>
  31 #include <errno.h>
  32 #include "builtinbuf.h"
  33
  34 void filebuf::init()
  35 {
  36   _IO_file_init(this);
  37 }
  38
  39 filebuf::filebuf()
  40 {
  41   _IO_file_init(this);
  42 }
  43
  44 #if !_IO_UNIFIED_JUMPTABLES
  45 /* This is like "new filebuf()", but it uses the _IO_file_jump jumptable,
  46    for eficiency. */
  47
  48 filebuf* filebuf::__new()
  49 {
  50   filebuf *fb = new filebuf;
  51   _IO_JUMPS(fb) = &_IO_file_jumps;
  52   fb->_vtable() = builtinbuf_vtable;
  53   return fb;
  54 }
  55 #endif
  56
  57 filebuf::filebuf(int fd)
  58 {
  59   _IO_file_init(this);
  60   _IO_file_attach(this, fd);
  61 }
  62
  63 filebuf::filebuf(int fd, char* p, int len)
  64 {
  65   _IO_file_init(this);
  66   _IO_file_attach(this, fd);
  67   setbuf(p, len);
  68 }
  69
  70 filebuf::~filebuf()
  71 {
  72   if (_IO_file_is_open(this))
  73     {
  74       _IO_do_flush (this);
  75       if (!(xflags() & _IO_DELETE_DONT_CLOSE))
  76         _IO_SYSCLOSE (this);
  77     }
  78 }
  79
  80 filebuf* filebuf::open(const char *filename, ios::openmode mode, int prot)
  81 {
  82   if (_IO_file_is_open (this))
  83     return NULL;
  84   int posix_mode;
  85   int read_write;
  86   if (mode & ios::app)
  87     mode |= ios::out;
  88   if ((mode & (ios::in|ios::out)) == (ios::in|ios::out)) {
  89     posix_mode = O_RDWR;
  90     read_write = 0;
  91   }
  92   else if (mode & ios::out)
  93     posix_mode = O_WRONLY, read_write = _IO_NO_READS;
  94   else if (mode & (int)ios::in)
  95     posix_mode = O_RDONLY, read_write = _IO_NO_WRITES;
  96   else
  97     posix_mode = 0, read_write = _IO_NO_READS+_IO_NO_WRITES;
  98   if (mode & ios::binary)
  99     {
 100       mode &= ~ios::binary;
 101 #ifdef O_BINARY
 102       /* This is a (mis-)feature of DOS/Windows C libraries. */
 103       posix_mode |= O_BINARY;
 104 #endif
 105     }
 106   if ((mode & (int)ios::trunc) || mode == (int)ios::out)
 107     posix_mode |= O_TRUNC;
 108   if (mode & ios::app)
 109     posix_mode |= O_APPEND, read_write |= _IO_IS_APPENDING;
 110   if (!(mode & (int)ios::nocreate) && mode != ios::in)
 111     posix_mode |= O_CREAT;
 112   if (mode & (int)ios::noreplace)
 113     posix_mode |= O_EXCL;
 114 #if _G_HAVE_IO_FILE_OPEN
 115   return (filebuf*)_IO_file_open (this, filename, posix_mode, prot,
 116                                   read_write, 0);
 117 #else
 118   int fd = ::open(filename, posix_mode, prot);
 119   if (fd < 0)
 120     return NULL;
 121   _fileno = fd;
 122   xsetflags(read_write, _IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING);
 123   if (mode & (ios::ate|ios::app)) {
 124     if (pubseekoff(0, ios::end) == EOF)
 125       return NULL;
 126   }
 127   _IO_link_in(this);
 128   return this;
 129 #endif
 130 }
 131
 132 filebuf* filebuf::open(const char *filename, const char *mode)
 133 {
 134 #if _G_IO_IO_FILE_VERSION == 0x20001
 135   return (filebuf*)_IO_file_fopen(this, filename, mode, 0);
 136 #else
 137   return (filebuf*)_IO_file_fopen(this, filename, mode);
 138 #endif
 139 }
 140
 141 filebuf* filebuf::attach(int fd)
 142 {
 143   return (filebuf*)_IO_file_attach(this, fd);
 144 }
 145
 146 streambuf* filebuf::setbuf(char* p, int len)
 147 {
 148   return (streambuf*)_IO_file_setbuf (this, p, len);
 149 }
 150
 151 int filebuf::doallocate() { return _IO_file_doallocate(this); }
 152
 153 int filebuf::overflow(int c)
 154 {
 155   return _IO_file_overflow(this, c);
 156 }
 157
 158 int filebuf::underflow()
 159 {
 160   return _IO_file_underflow(this);
 161 }
 162
 163 int filebuf::sync()
 164 {
 165   return _IO_file_sync(this);
 166 }
 167
 168 streampos filebuf::seekoff(streamoff offset, _seek_dir dir, int mode)
 169 {
 170   return _IO_file_seekoff (this, offset, dir, mode);
 171 }
 172
 173 filebuf* filebuf::close()
 174 {
 175   return (_IO_file_close_it(this) ? (filebuf*)NULL : this);
 176 }
 177
 178 streamsize filebuf::sys_read(char* buf, streamsize size)
 179 {
 180   return _IO_file_read(this, buf, size);
 181 }
 182
 183 streampos filebuf::sys_seek(streamoff offset, _seek_dir dir)
 184 {
 185   return _IO_file_seek(this, offset, dir);
 186 }
 187
 188 streamsize filebuf::sys_write(const char *buf, streamsize n)
 189 {
 190   return _IO_file_write (this, buf, n);
 191 }
 192
 193 int filebuf::sys_stat(void* st)
 194 {
 195   return _IO_file_stat (this, st);
 196 }
 197
 198 int filebuf::sys_close()
 199 {
 200   return _IO_file_close (this);
 201 }
 202
 203 streamsize filebuf::xsputn(const char *s, streamsize n)
 204 {
 205   return _IO_file_xsputn(this, s, n);
 206 }
 207
 208 streamsize filebuf::xsgetn(char *s, streamsize n)
 209 {
 210     // FIXME: OPTIMIZE THIS (specifically, when unbuffered()).
 211     return streambuf::xsgetn(s, n);
 212 }
 213
 214 // Non-ANSI AT&T-ism:  Default open protection.
 215 const int filebuf::openprot = 0644;